Identify the regions in India where vast reserves of natural gas are found.
Natural gas, colorless highly flammable gaseous hydrocarbon consisting primarily of methane and ethane. Natural gas was formed millions of years ago when plants and tiny sea animals were buried under sand and rock. It is a product of decomposed organic matter, typically from ancient marine microorganisms. In India, natural gas is available in various parts of the country such as Assam, Gujarat, Andhra Pradesh, etc.